论文标题
二维双层半导体连接中的层间激发子绝缘子：明显可解决的模型
Interlayer excitonic insulator in two-dimensional double-layer semiconductor junctions: An explicitly solvable model
论文作者
论文摘要
激子绝缘子既不导致电子和孔，而是绑定的电子孔对，激子。不幸的是，不可能在单个半导体层中独立注射和检测电子和孔电流。但是，层间激子绝缘子提供了可以实现激子电流测量值的电子和孔的空间分离。问题在于，空间分离削弱了电子孔配对，并可能导致层间激子分离。在这里，我们开发了一个明确的可解决模型，以确定足够强的层间分离，以防止电子和孔在层上跳跃，但仍允许电子孔配对足以过渡到中间层激发型绝缘子状态。一个理想的交界处，可以意识到这样的状态将包括一对相同的狭窄差异二维半导体，该差距由宽间隙介电层隔开，具有低介电介电常数。本研究通过考虑层间相干效应来量化这种结的参数。
Excitonic insulators conduct neither electrons nor holes but bound electron-hole pairs, excitons. Unfortunately, it is not possible to inject and detect the electron and hole currents independently within a single semiconducting layer. However, interlayer excitonic insulators provide a spatial separation of electrons and holes enabling exciton current measurements. The problem is that the spatial separation weakens electron-hole pairing and may lead to interlayer exciton disassociation. Here we develop an explicitly solvable model to determine an interlayer separation that is strong enough to prevent electron and hole hopping across the layers but still allows for electron-hole pairing sufficient for transition into an interlayer excitonic insulator state. An ideal junction to realize such a state would comprise a pair of identical narrow-gap two-dimensional semiconductors separated by a wide-gap dielectric layer with low dielectric permittivity. The present study quantifies parameters of such a junction by taking into account interlayer coherence effects.
